# -*- coding: utf-8 -*-#
#-------------------------------------------------------------------------------
# 建立者:        潘炎珍  
# Name:         demo16
# Description:
# Author:       98745
# Date:         2019/3/12
#-------------------------------------------------------------------------------

import numpy
import matplotlib.pyplot as plt
plt.rcParams['font.sans-serif']=['SimHei']
x=numpy.linspace(-5,5,1024)
y=0.25*(x+4)*(x+1)*(x-2)
plt.text(-1,-0.3,'新的注释')
plt.plot(x,y,c='r')
plt.show()